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We report the results of an analysis of data obtained with the  International Gamma‐Ray Astrophysics Laboratory  ( INTEGRAL ),  Swift  and  Rossi X‐ray Timing Explorer  ( RXTE ) observatories during the 2010 April and September outbursts of the X‐ray pulsar RX J0440.9+4431. The temporal and spectral properties of the pulsar in a wide energy band (0.6–120 keV) were studied for the first time. We discovered a ∼32‐keV cyclotron resonant scattering feature in the source spectrum that allowed us to estimate the magnetic field strength of the neutron star as  B ≃ 3.2 × 10 12  G. The estimate of the magnetic field strength was confirmed by a comprehensive analysis of the noise power spectrum of the source. Based on the recurrence time between Type I outbursts, the orbital period of the binary system can be estimated as ∼155 d. We have shown that the pulse profile has a sinusoidal‐like single‐peaked shape and has practically no dependence on the source luminosity or energy band.

Broad‐band observations of the Be/X‐ray binary pulsar RX J0440.9+4431: discovery of a cyclotron absorption line